Hi, I am currently working on two detent chronometer pocket watches that suffer the same symptom: running too fast. One gains a few minutes in an hour while the other one basically running 2X the speed (i.e. gaining 30 mins in 30 mins). I think the teeth on the escapement wheels are worn that pallet of the balance wheel would sometimes miss the teeth. When the pallet misses a teeth, it skips to the next teeth that it can touch. (the wheel in the above picture is about 1cm in diameter, including the teeth) Based on my observation, the one that gains only(?) a few minutes per hour has one teeth worn. That means the pallet only touches 14 out of the 15 teeth on the escapement wheel per cycle, so it is about 1/15 faster than normal. The other one has several teeth worn so the it basically runs at 2X speed because only about half of the teeth can touch the pallet. My question is that: is there a way to fix the wheel? Or wheel replacement is the only option? I have searched a bit and I could not find any detent escapement wheel replacement for sell. I also browsed through the pinned thread "Chronometer Parts and Service Sources", and I am not sure if any of them provides custom made escapement wheel service. Please enlight me if you have had similar experience.